They can be. Because of course there are poorly made commercial units that are only quiet because they have low CADR. But you’ll never be able to get a DIY box as quiet as a well made unit, unless you basically engineer your own air purifier device, use blower motors, etc., but that’s not a Corsi-Rosenthal Box.

It’s not just about aesthetics. That DIY box will be loud as hell.

OP is from the future, when GPUs are a subscription service that processes your graphics online.

Veritasium. Over time I realized his content is mostly about flashy half baked “sciencey” content like Discovery Channel. It’s meant to get an audience and nothing more. It lacks quality control, and fact checking. I only realized how many errors his videos have when he covered a topic I know more about. Also, the whole electricity thing and self driving car debacle only reinforced my views on his content.

I like it inside, where you loop it through the tube.

In 2024 life is hard and you can’t do anything about it in most cases. Religion gives you an excuse for why it must be so, so that you can keep grinding away.

Calculator about HDMI and displayport bandwidth that might help: https://linustechtips.com/topic/729232-guide-to-display-cables-adapters-v2/?section=calc&mode=maxfreq&H=3840&V=2160&F=120&bpc=10&compression=dsc2.5x&calculations=show

As you go up in complexity like 4k and 4:4:4 HDR, you will have to pay more attention to HDMI bandwidth and cable length limits.

Look for “certified” premium or high speed cables.